Ken Griffin
MIAX

Ken Griffin’s Miami International Holdings MIAX Stock Holding History

Ken Griffin’s Portfolio MIAX Stock Details MIAX Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$62.6M Buy
1,607,780
+988,200
+159% +$40.7M 0.01% 1158
2025
Q4 		$27.5M Sell
619,580
-355,470
-36% -$15.9M ﹤0.01% 2003
2025
Q3 		$39.3M Buy
+975,050
New +$35.7M 0.01% 1621

Other funds holding MIAX

T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return
HKAM
Horizon Kinetics Asset Management New York $8.82B AUM 23.05% 1-Year Est. Return
Susquehanna International Group
Susquehanna International Group Bala Cynwyd, Pennsylvania $893B AUM 36.07% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
Alyeska Investment Group
Alyeska Investment Group Chicago, Illinois $35.4B AUM 33.54% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Adage Capital Partners
Adage Capital Partners Boston, Massachusetts $64.8B AUM 42.7% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return

Ken Griffin's MIAX Position: Q1 2026 in Review

Ken Griffin increased its Miami International Holdings (MIAX) stake by 159% in Q1 2026, buying an estimated $40.7M and bringing the position to 1,607,780 shares worth $62.6M. The position accounts for 0.01% of the portfolio, ranked #1158.

Ken Griffin first reported a position in MIAX in Q3 2025 and has held it in 3 quarters since. 201 funds tracked by Wall St. Rank hold MIAX as of Q1 2026.

  • Ken Griffin held 1,607,780 shares of Miami International Holdings worth $62.6M as of Q1 2026.
  • Ken Griffin bought 988,200 Miami International Holdings shares in Q1 2026, an estimated $40.7M.
  • Miami International Holdings made up 0.01% of Ken Griffin's portfolio in Q1 2026, its #1158 holding.
  • Ken Griffin first reported a position in Miami International Holdings in Q3 2025 and has held it in 3 quarters since.
  • 201 funds tracked by Wall St. Rank held Miami International Holdings as of Q1 2026.

Based on Citadel Advisors's 13F filing for Q1 2026, filed 15 May 2026.